Covalent organic polymer derived carbon nanocapsule–supported cobalt as a catalyst for activating monopersulfate to degrade salicylic acid
| Autor: | Eilhann E. Kwon, Shaoping Tong, Kun-Yi Andrew Lin, Fang-Chih Chang, Duong Dinh Tuan, Siming You, Pen-Yuan Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Carbonization Process Chemistry and Technology chemistry.chemical_element Nanoparticle 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology 01 natural sciences Pollution Nanocapsules Catalysis chemistry Chemical engineering Covalent bond Reagent Chemical Engineering (miscellaneous) 0210 nano-technology Waste Management and Disposal Cobalt Carbon 0105 earth and related environmental sciences |
| ISSN: | 2213-3437 |
| Popis: | As salicylic acid (SAC) is an extensively used pharmaceutical, discharge of SAC into the environment has caused serious threats to ecology in view of its toxicity. Therefore, SO4•−-involved chemical oxidation methods have been employed for eliminating SAC. Since monopersulfate (MPS) has become a popular reagent for producing SO4•−, an alternative heterogeneous Co-based catalyst is proposed by using a Co-coordinated covalent organic polymers (Co-COP) as a precursor. Via carbonization, Co-COP is transferred by conversion of Co ions to Co/CoO nanoparticle and conversion of COP to N-doped carbon nanocapsules (CNC), respectively, to form a unique composite of Co NPs embedded into carbon nanocapsule (CoCNC). CoCNC exhibits a higher catalytic activity than Co3O4 nanoparticle for activating MPS to degrade SAC because of synergistic effects between Co NPs and the N-doped CNC which not only acts as the support but also provides active sites. Hence, CoCNC+MPS could afford a much lower Ea value (25.4 kJ/mol) of SAC degradation than the reported values. Moreover, CoCNC is still efficient for removing SAC even in the presence of high-concentration NaCl and SDS. CoCNC can be also recyclable over many cycles and maintain its catalytic activities, confirming that CoCNC is an advantageous catalyst for MPS activation. |
| Databáze: | OpenAIRE |
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